Jupyter Kernel Subprocess do not work on Windows and Mac

[scopatz]

As reported here: https://github.com/xonsh/xonsh/pull/2756#issuecomment-410950907

Expected Behavior

Subprocesses should display their output.

Current Behavior

They do not.

Steps to Reproduce

Run Jupyter on Windows

For community

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[eggcaker]

same on mac osx 10.13.3

[scopatz]

@eggcaker - are you on xonsh 0.7.3?

[eggcaker]

@scopatz yes , installed the 0.7.3 by pip

+------------------+---------------------+
| xonsh            | 0.7.3               |
| Git SHA          | 9bbbf07b            |
| Commit Date      | Aug 2 18:08:44 2018 |
| Python           | 3.6.5               |
| PLY              | 3.9                 |
| have readline    | True                |
| prompt toolkit   | 1.0.15              |
| shell type       | prompt_toolkit1     |
| pygments         | 2.2.0               |
| on posix         | True                |
| on linux         | False               |
| on darwin        | True                |
| on windows       | False               |
| on cygwin        | False               |
| on msys2         | False               |
| is superuser     | False               |
| default encoding | utf-8               |
| xonsh encoding   | utf-8               |
| encoding errors  | surrogateescape     |
+------------------+---------------------+

I'm not sure it's bug or not, when I write ls ~/ in a cell for example, after ran this cell got nothing output, but if i ran files = $(ls ~/), then print (a) the output is correct.

[melund]

when I write ls ~/ in a cell for example, after ran this cell got nothing output, but if i ran files = $(ls ~/), then print (a) the output is correct.

That is also what I see. The python output works well, but subproc output does not work.

[scopatz]

Hmmmm weird! Thanks for letting me know!

[ixemad]

Hi there!

Same behavior in a Linux Ubuntu 20.04 with xonsh 0.14.0, xontrib-jupyter-shell 0.2.0 and Jupyter Lab 4.0.0.

+------------------+---------------------------------------------------------------+
| xonsh            | 0.14.0                                                        |
| Python           | 3.11.3                                                        |
| PLY              | 3.11                                                          |
| have readline    | True                                                          |
| prompt toolkit   | 3.0.38                                                        |
| shell type       | prompt_toolkit                                                |
| history backend  | json                                                          |
| pygments         | 2.15.1                                                        |
| on posix         | True                                                          |
| on linux         | True                                                          |
| distro           | ubuntu                                                        |
| on wsl           | False                                                         |
| on darwin        | False                                                         |
| on windows       | False                                                         |
| on cygwin        | False                                                         |
| on msys2         | False                                                         |
| is superuser     | False                                                         |
| default encoding | utf-8                                                         |
| xonsh encoding   | utf-8                                                         |
| encoding errors  | surrogateescape                                               |
| jupyter          | True                                                          |
| jupyter kernel   | ~/.pyenv/versions/xontrib-jupyter/share/jupyter/kernels/xonsh |
| xontrib 1        | jupyter                                                       |
| RC file 1        | ~/.xonshrc                                                    |
+------------------+---------------------------------------------------------------+

As you can observe below, this is the same behaviour as the one commented by @eggcaker some years ago.

I also noted that the output for the first cell is printed in the standard output as shown below.

[ixemad]

Related to my last comment some months ago, you have to set the variable XONSH_CAPTURE_ALWAYS and XONSH_SUBPROC_CAPTURED_PRINT_STDERR to True in order to capture shell output directly into Jupyter. That's easy!